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Subject: [media] Guard a divide in v4l1 compat layer Author: Dr. David Alan Gilbert <[email protected]> Date: Sun Oct 24 13:33:09 2010 -0300 Hi, I managed to trigger a divide by 0 in the v4l compat code with the mem2mem test module; I suspect perhaps it shouldn't have been returning a 0 pixel wide picture, but either way it seems right to guard this divide by 0 in the compatibility layer. Tested on 2.6.36 (ubuntu build, but the code in this is the same as upstream), but ***not tested with a real video device***. Signed-off-by: Dr. David Alan Gilbert <[email protected]> cc: stable.kernel.org Signed-off-by: Mauro Carvalho Chehab <[email protected]> drivers/media/video/v4l1-compat.c | 13 ++++++++++--- 1 files changed, 10 insertions(+), 3 deletions(-) --- http://git.linuxtv.org/media_tree.git?a=commitdiff;h=910f5f05f99c1ffbb484c4e6eb2a460e7a08e2d7 diff --git a/drivers/media/video/v4l1-compat.c b/drivers/media/video/v4l1-compat.c index 0c2105c..d4ac751 100644 --- a/drivers/media/video/v4l1-compat.c +++ b/drivers/media/video/v4l1-compat.c @@ -645,9 +645,16 @@ static noinline long v4l1_compat_get_picture( goto done; } - pict->depth = ((fmt->fmt.pix.bytesperline << 3) - + (fmt->fmt.pix.width - 1)) - / fmt->fmt.pix.width; + if (fmt->fmt.pix.width) + { + pict->depth = ((fmt->fmt.pix.bytesperline << 3) + + (fmt->fmt.pix.width - 1)) + / fmt->fmt.pix.width; + } else { + err = -EINVAL; + goto done; + } + pict->palette = pixelformat_to_palette( fmt->fmt.pix.pixelformat); done: _______________________________________________ linuxtv-commits mailing list [email protected] http://www.linuxtv.org/cgi-bin/mailman/listinfo/linuxtv-commits
